Options Database Key

-ksp_norm_type <none,preconditioned,unpreconditioned,natural> -
Notes:
Not all combinations of preconditioner side (see KSPSetPCSide()) and norm type are supported by all Krylov methods.
If only one is set, PETSc tries to automatically change the other to find a compatible pair. If no such combination
is supported, PETSc will generate an error.